Get rid of NULLs in fpdfsdk/

fpdfsdk/formfiller/cffl_iformfiller.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "fpdfsdk/formfiller/cffl_iformfiller.h"
 
 #include "core/fpdfapi/fpdf_page/include/cpdf_page.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h"
@@ skipping 79 matching lines @@
         }
       }
       return;
     }
   }
 
   if (CFFL_FormFiller* pFormFiller = GetFormFiller(pAnnot, FALSE)) {
     pFormFiller->OnDrawDeactive(pPageView, pAnnot, pDevice, pUser2Device,
                                 dwFlags);
   } else {
-    pWidget->DrawAppearance(pDevice, pUser2Device, CPDF_Annot::Normal, NULL);
+    pWidget->DrawAppearance(pDevice, pUser2Device, CPDF_Annot::Normal, nullptr);
   }
 
   if (!IsReadOnly(pWidget) && IsFillingAllowed(pWidget))
     pWidget->DrawShadow(pDevice, pPageView);
 }
 
 void CFFL_IFormFiller::OnCreate(CPDFSDK_Annot* pAnnot) {
   if (CFFL_FormFiller* pFormFiller = GetFormFiller(pAnnot, FALSE)) {
     pFormFiller->OnCreate(pAnnot);
   }
@@ skipping 897 matching lines @@
           bExit = TRUE;
           m_bNotifying = FALSE;
           return;
         }
       }
 
       m_bNotifying = FALSE;
     }
   }
 }